it's not important to say each other "i love you"
most of the time women feel shy to tell this, but man not.
indian films are really very exagreegate on love and marriage issues. they are fake not real in life.they are just made by human not in reality.

you think yourself, how it's possible to fight with lots of people and get someone from them, marry her at this 3 hours film!!it's really conjust our mind and later we suffer for this.
so don't see indian movies.or never compare real life with films.

the problem with her is that she came from such family where they are not too much showing love each other. may be she lived a very sad life/she love someone and not get him as a result she is not happy on her life.but you don't need to think about that.don't force her to say something what she don't. just do what i am telling:

in this situation you need something to do..
you can go for some trip, better umrah in saudi arabia.
there you will have lots of time to stay with her. and from there you will see how the relation get closer. you will see how she loves you from there. just go and see.

because life is not a film, it's the reality and that's it.so don't be too upset. do what i said to you. tell her that you and she want to go for umrah what she say let me know...